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I have run back to back runs (same day an hour apart)on the Demon switching from Flowmasters to Magnaflow, I saw no difference in ET or MPH on my car. The Magnaflows are a bit quieter. 3" TTI exhaust with x pipe ending at the rear axle. 40 series flowmaster and Magnaflow ultra.


same here I ran 3 inch 2 chamber flowmasters on a 572 wedge Then changed them to Magnaflow ultra the car ran the EXACT same ET and MPH!! the difference is I didn't tick off all the neighbors with the Magnaflows driving home from the track at midnight, as the flowmasters are quite loud